Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Status Confirmed
Seminar Series TQM
Subjects cond-mat
Date Thursday 24 November 2022
Time 14:00
Institute LPTHE
Seminar Room INSP Jussieu towers 22-23 room 3-17
Speaker's Last Name Capone
Speaker's First Name Massimo
Speaker's Email Address capone [at] sissa [dot] it
Speaker's Institution SISSA Trieste
Title Competing Correlated Insulators in multi-orbital systems coupled to phonons
Abstract It is nowadays established that multi-orbital correlated materials display a number of distinctive phenomena which can be captured in terms of Hubbard models featuring the interplay between Hubbard repulsion U and the Hund’s exchange J. In this talk I will address how an electron-phonon coupling affects this picture. I will show that a Jahn-Teller coupling coexists with the Mott localization driven by the Hubbard repulsion U, but it competes with the Hund's coupling J. This interplay leads to two spectacularly different Mott insulators, a standard high-spin Mott insulator with frozen phonons which is stable when the Hund's coupling prevails, and a low-spin Mott-bipolaronic insulator favoured by phonons, where the characteristic features of Mott insulators and bipolarons coexist. The two phases are separated by a sharp boundary along which an intriguing intermediate solution emerges as a kind of compromise between the two solutions. I will finally address the stability of this scenario when doping is included.
arXiv Preprint Number

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